Please help I’ll give brainliest

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

Select a graph that have an equation with a < 0

Solve for x where 0 equation: cot^2x+2cotx+1=0